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Ive not used expanding foam, just recently been using the hd foam blocks to shape parts, should be similar and I'm using same kind of process to you.
Id say 80% is technique and 20% in the foam, don't apply any filler unless the foam is spot on as you are only skinning this with a millimeter of top coat.
you want to be putting the filler on super thin then sanding back very carefully.
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